Patents by Inventor Denys Leclerc

Denys Leclerc has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for determining chemical pulp Kappa number with visible-near infrared spectrometry
    Publication number: 20060196622
    Abstract: A method for the determination of cellulosic-fibre properties, such as, but not limited to, residual lignin content of chemical pulp, with the aid of a spectroscopic technique obtained over a range covering the visible and the near-infrared regions of the electromagnetic spectrum, comprising the steps of obtaining a sample from the process line, minimally removing some excess water, exposing the fibres in the sample to a large beam light source, optionally moving the sample at a constant speed, and acquiring the spectral data over a pre-determined length of time, and correlating the spectrum to a previously determined calibration so as to determine the Kappa number.
    Type: Application
    Filed: March 1, 2006
    Publication date: September 7, 2006
    Inventors: Thanh Trung, Stephen Betts, Denys Leclerc
  • Kraft pulp yield by heat treatment of polysulphide liquors generated by oxidation
    Publication number: 20050072539
    Abstract: Oxidized white liquor is heat treated to increase the concentration of polysulphide measured at 285 or 286 nm (PSUV) or measured at 416 nm (PSVIS) and the PSUV/PSGR or PSVIS/PSGR ratio, whereby the content of active polysulphide in the total polysulphide is increased which active polysulphide can be exploited to increase pulp yield in Kraft pulping.
    Type: Application
    Filed: November 19, 2004
    Publication date: April 7, 2005
    Inventors: Ronald van Heek, Gilles Dorris, Victor Uloth, Natalie Page, Thomas Hu, Denys Leclerc
  • Method for determining liquid content in chemical pulps using ramen spectrometry
    Patent number: 6551451
    Abstract: A rapid method is provided for the on-line spectroscopic determination of lignin content and/or kappa number in wood pulps. Unlike currently available commercial instrumentation, the method enables one to measure lignin content independently of species variations and pulp consistency.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: April 22, 2003
    Assignee: Pulp and Paper Research Institute of Canada
    Inventors: Thanh P. Trung, Denys Leclerc
  • Determination of kappa number in chemical pulps by raman spectrometry
    Publication number: 20010017195
    Abstract: A rapid method is provided for the on-line spectroscopic determination of lignin content and/or kappa number in wood pulps. Unlike currently available commercial instrumentation, the method enables one to measure lignin content independently of species variations and pulp consistency.
    Type: Application
    Filed: December 20, 2000
    Publication date: August 30, 2001
    Inventors: Thanh P. Trung, Denys Leclerc